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ALBERT H. MEESHON .0F PHILADELPHIA, PENNSYLVANIA.

LeifefsiPafenz No. 77,512, 1aed May 5, 1868.

IMPROVEMENT vIN DAMPEE'S PoR Bor-AIE PUENAGES.

@tigt Stljehule reftttstiu im time Miers tant zznx'mnkug pattini'theatre To ALL WHOM IT MAX coNcERN: v v i Be it known that I, ALBERT HAMERSEON, of Philadelphia, in the State of Pennsylvania, have invented anew and usefulmprovement on my Mode ofRegulating the Draught ofHot-AirFurnaces, For which I holda patentfrom the United States, dated May 29,18,66, combined with a dust-flue; and I' do herebydeclare that thefollowing is a't'ull, clear, and exact description offthe constructionand'operation of the same, reference being had tothe annexed drawings,making a part of this specification. i

AIattach to the ,chain- A, forming part ,ofmy patent aforesaid,V thechain B, at a point,'E, at a. distance below the pulleys D D, greaterthanl the range of motion of the Hue-door F,passing said chain B overthe pulleys D D,4 and attaching it with a hook at the point C, to' thesloping door' F, hinged above lat G,Aand made` sui. ciently heavy toclose'by its own weight when there is no tension on the chain B, inthe1same manner as the draught-door H, forming part of my patent aforesaid,closes yhy its own weight.' The door Fis lighter than the* door H. Thedoor F opens-vinto a horizontal flue, I, which connects with 'thefurnace-Hue K. .The damper M, which is opened or closed at pleasure bymeans ofthe handleO, -separates thelflue frotutlieasli-pit N. Thisdamper is' always closed, except when the fire is raked, lw-hen'it isopened Lto allow th'e -dust to lpass in theue I, `from which it isvremoved at pleasure through' the door F. i i I The operation of myinveutirntlius descrihed,'i`sv as follows: Th'e draught-door lH-beingheavier than the Hue-door F, when said draught-doorH is closed, itsweight inclosing, through the .attachment and arrangement of the chainB, and pulleys D D and 'chain A,opcns the flue-door F,andAadrnits,afbody o f cold-air into .the horizontal u'e I, which passesinto4 the furnace-flue K, (the damper'M being closed,) 'and lchecks thedraught of the furnace at .the mouthl of the vpipe-L. Again, thcdraught'door H hengoponed,thchain B- is -sl ackened,

and the flue-door F closes by Aits own'wei'ght, thus permitting anuninterruptedtlrau'vght through-the furnace and'drums and'pipei, intothe flue K... l What-. .Iclaim as my invention, and desire to. secure byLetters Patent, is

The chaiuB, pulleys D D, door F, horizontal line I,"and damper M,whencombined and constructed 4substantially as and for the nul-posesherein described.

ALBEETII. MERSHON. Witnesses:

HERGEsIiEIMER,-

GEORGE 'B. MEEsHoN.

